Magnetic holder-on



w. MEYER MAGNETI C HOLDER Apr. 24, 1923. I

Filed April 16 1920 vwemtoz To all whom it may conce'm I Patented Apr. 24, 1923.

' watchman Meander weal-mum; NEW sonic, n

, maenn'rrc aleases.

Applicationfl1edApri1 16,-1920. ser n 'enaav. 7

Be it'known that I, WALDEMAR MEYER, a citizen of the United States, and resident of Woodhaven, in the county "offQueens and State of New York, have invented certain new and useful Magnetic Holder-Ons, of which the following is a specification. 1

This invention relates to holder-on, and has particular refere-nce'to the provision of magnetically operate-d holder on for use 1n riveting, wherebythe manual labor now required by a rivete'r is reduced,-and better and more rapid work produced with a less skilled operator. e I i By this invention, the manual work of holding thev toolto'the work is largely done by a magnet without especial attention on the part of the operator, leaving him free to devote his entire attention to the accurate and tight setting of the rivet.

The invention comprlses in combination with a. rivet set, a magnet having a pole or poles disposed adjacent the set for holding to the work to preferably provide a three point engagement, with provision for relative movement of at least one so that flat, curved, or lapped work can behandled with one tool, with either automatic or simple hand adjustment to fit the contour of the work.

In the accompanying drawings,

Figure l is an elevation, partly in section of a preferred form.

Figure 2 is a bottom plan view.

1 represents a frame or bar of magnetizable material carrying a handle2 fastened by nuts, and two cores 3, 3, having magnetizing windings a. Each core 3 carries an adjustable headed plug 5, threaded therein,

The shank passesthrough expansion spring 12 and is limited in one direction by" the enlarged portion striking the bar 1], and ,ad-,

j'ustably in the'op-posite direction by the adjustment of nut 14 on threaded end 13. The yielding movement is very slight, and the spring cannot disengage the tool when the current is on, nor does the spring materially yield under the hammer blow. The electric circuitis by wire 16 to switch plugs to the work, as lapped By the foregoing construction is provided for holding to the work and ai holder for bearingon the rivet head. By adjustment of one or both core endplugs, it will be seen magnetic continuity between the'core'and the work, and between the core and the-bar,

in no way impaired. For'curved work, it may be desirable to use end 'plugs'specially blade 17, by wire 18"through bothcoils 4 and may thenbe grounded on the handle, or may return by wire 19.

arivet holder-on comprising magnetic means formed and adjusted to fit the particular contour so as to insure a good magnetic circuit without unnecessary air gaps.

Inactualpractice with this tool in setting.

a large number of rivets on various kinds of work a declded saving 1n t1me and effort has been obtained, as well as more regularly formed and tighter rivets than is obtained in ord nary practicewith previous devices.

Various modificatlons and changes may be made in the specific details without departing from the scope of the appended claims.

lVhat I claim is: 1. A holder-on comprising a bar, a pluralit of electromagnets secured to the bar,

a ho der carried by the bar and adapted to engage a rivet head, and means between said electromagnets and thework foradjust-ing the distance between a magnet coil and the work to conform to the contour of the work.

2. A holder-on comprising in combination, a bar, a magnet secured thereto for cooperation with the work, a holder carried by the bar and adapted to engage a rivet head, and a plug removably secured to the magnet between it and the work to adjust the elevation between the ends of the holder and magnet to conform to the contour of the work. I

3. In an electro-magnetic holder-on, a bar,

a holder. yieldingly supported by said bar,

solenoids carried by said bar on each side of said holder a handle attached to the bar, and a control switch for the solenoids lomagnet comprising a core carried by said bar, a coil on said core, and an adjustable pole piece in the end of said core.

netic means for holding the bar to the work.

6. A holder-on comprising a bar, an electromagnet secured thereto for cooperation with the work, a holder slidable through said bar, means on each side of the barto limit the movement of theholder in either direction, and a yield-able means .in cooperation with said bar and holder to holder against the work. a

7. A holder-on comprising a bar, a plurality of magnets secured to the bar, 'a handle also fastened to the bar, a holder slidable through the bar, and a clamping means securing both the handle and the magnet to the bar.

8. In a holder-on, the combination with a bar, of an electromagnet'clamped to the 2 bar for cooperation with the work, the pole press the piece of the magnet adjacent thework being provided with a plug removably threaded to an end portion or" the magnet, and a backing washer placedbetween said magnet and lug. 9.. n a holder-on, the combination with a plurality of spaced electromagnets for cooperation withthe work, a bar adapted to form a part of the magnetic circuit to which said magnets are clamped to givea low reluctance to the magnetic circuit, means for varying the elevation of at least one of the magnets relative to the Work, a holder'slidable through the bar and provided with means for limiting the movement of the holder inv either direction, a yieldable means in cooperation with said bar and holder to press the holder against the work, a handle secured to the bar, and a controliswitch for themagnets located adjacent the handle.

Signed at New York, in the county of New York and State of New York, this 3d day of April, A. D. 1920. a

'WALDEMAR MEYER. I 

